On 8 Jan 2011 at 13:27, Christopher Zach wrote:
> So I will assume that the gauges calculate based on the 10.4kw.
>
> The Prizm has a
[email protected] or 15.6kw pack. Usable capacity at 60a
> draws (highway speed) is 12.6kw to empty. Using the 20% reserve capacity rule
> (discharge to 80%) we get a usable capacity of 10.08kw.
>
> On the drive to the house, the Volt covered the distance using 70% of
> it's usable battery capacity. Based on it's pack capacity of 10.4kw
> usable that put it at 7.280 kw used.
>
> The Prizm making the same run uses
[email protected] (average) to go the exact
> same distance.
s/kw/kWh/g
> That works out to 6.9kw/hr.
s/kw\/hr/kWh/
For those who don't speak sed*, that's a reminder that the correct unit for
EV energy usage is the kiloWatt hour, abbreviated kWh. (Mis)using kW for
that purpose is like saying that you just filled your ICEV's gas tank with
20 horsepower.
I don't mean to be snarky or anything. I'm sincere here, trying to see that
the list archive reflects the correct units of EV energy-use measurement. I
think we EV hobbyists damage our own credibility as a group when we aren't
reasonably careful with our nomenclature.
It only takes one more keystroke to type the correct unit abbreviation,
folks, so please try to be accurate - if only for the sake of the newbies
reading what you write.
Thanks.
PS - Christopher, thanks for posting the comparison. It's interesting that
the Volt, a fairly complex and heavy car, comes so close to the Prizm
conversion in energy use.
Now it would be nice to know what the distance was, so we'd have a real-
world kWh/mi figure for the Volt.
I would also suggest that you measure the usage several times and average,
so as to partially compensate for variable conditions.
-----
*The *nix text stream editor. The command shown globally substitutes the
string "kWh" for the string "kw". The syntax also applies to other *nix
editing utilities.
David Roden - Akron, Ohio, USA
EVDL Administrator
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